Chucks or sockets – With fluid-pressure actuator – Jaw is expansible chamber; i.e. – bladder type
Reexamination Certificate
1999-12-03
2001-11-06
Bishop, Steven C. (Department: 3722)
Chucks or sockets
With fluid-pressure actuator
Jaw is expansible chamber; i.e., bladder type
C279S002080, C403S031000, C409S234000
Reexamination Certificate
active
06311987
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to hydraulic pressure arrangements.
2. Description of the Related Art
A variety of spindle mounted balancers have been designed over the years having the meaning to simplify and improve the accuracy of manual balancing methods. Attention shall be given to those designed to operate while the spindle is revolving. Such balancers, generally known as unbalance compensators, can be broadly classified into two categories; mechanical and fluid operated. The mechanical types cannot, however, do both large and fine balance corrections at the same time. Such balancing arrangements have been illustrated for example in U.S. Pat. No. 2,518,226 (Drake), U.S. Pat. No.4,683,681 (Russ) and the PCT publication number WO82/00353.
Also the following publications present structures belonging to this technological field. The U.S. patent publications 5,174,585 (Rinne), 2,324,225 (Mueller), 2,553,990 (Vidal), 2,652,749 (Hagmeister), 2,794,661 (Sears), 2,826,420 (Klinger), 2,852,287 (Baker), 2,911,222 (Eve), 3,259,020 (Walker), 4,430,017 (Stefanicich) and the UK patent publication 2007550 disclose fastening means for axial bodies based on the idea of using hydraulic pressure in a closed cylindrical space to deform a fastening sleeve and to clamp a tool accurately with high torque.
Releasable hydraulic chucks are widely used to clamp tools and workpieces. However, these clamping means involve problem of oil leaks and they require big size which is causing weight and therefore unbalances.
SUMMARY OF THE INVENTION
An object of the present invention is to avoid the drawbacks of the known technology and to provide a well balanced toolholder whereby its own design is so well balanced that only the additional unbalance of the tool or workpiece to be clamped need to be balanced. The object mentioned above includes quickly operable pressurizing means and an unleakable piston and seal arrangement for a clamping device, whereby said problems can be eliminated.
A guide surface which is inclined or bent with respect to the moving direction is moved via an actuating element, particularly designed as a ring. On this guiding surface an actuator is sliding which in turn moves a pressure transfer piston which is movable in a pressure cylinder to a clamping means. The actuator is advantageously a ball, which rolls on the guiding surface. In the pressure transfer piston the actuator is supported by means of a support element, particularly made of a slippery PTFE-material which is able to creep under pressure. The pressure transfer piston further comprises a sealing to maintain the pressure applied by the actuator in the pressure cylinder.
By the help of the present invention a new and improved design and way to use a piston and seal arrangement for a clamping device can be achieved. As an advantage the invention provides a fast way to clamp a toolholder or the like. Further the device is light weight, accurate, symmetrical and has automatic balancing properties.
As the pressurizing ring of the toolholder is floating on the pressurized bearing balls the ring can find the best balance position for itself when the spindle is turning with high speed and still at the same time the ring is functioning as a pressurizing device of the clamping tool. The balancing ability is, of course, depending on the weight of the ring and the gap between the body and the ring which defines possible movement of the ring.
Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 2826420 (1958-03-01), Klingler
patent: 2911222 (1959-11-01), Eve
patent: 5018916 (1991-05-01), Bauch et al.
patent: 5052866 (1991-10-01), Bauch et al.
patent: 5435577 (1995-07-01), Bauer et al.
patent: 5944325 (1999-08-01), Schmeisl
patent: 465219 (1950-05-01), None
patent: 4106504 (1992-04-01), None
patent: 4232282 (1994-03-01), None
patent: 93527 (1994-08-01), None
Rinne Erkki
Toikka Lauri
Birch & Stewart Kolasch & Birch, LLP
Bishop Steven C.
Unicraft Oy
LandOfFree
Hydraulic pressurizing arrangements does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic pressurizing arrangements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic pressurizing arrangements will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2604242